146943.fig.002a
(a)
146943.fig.002b
(b)
Figure 2: Plots of the centroids of the fitted Gaussian functions for BSA scatter-corrected (a) cylinder and (b) cone phantoms using various mixtures of methanol and water to simulate different uniform tissue densities. NIST-based attenuation values are indicated by matching tick marks on the y-axis of the cylinder graph. The cone phantom results indicate a significant dependence of the measured attenuation value on object size.